fix: use correct hex capacity for word and digest hex encoding #1631
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Adjust hex encoding buffers to allocate enough capacity for the full 64-character hexadecimal representation of a Word. Previously we used 32/Word::SERIALIZED_SIZE (bytes) as the Vec capacity, which was half of the required number of characters and caused unnecessary reallocations; now both word.rs and digest.rs use Word::SERIALIZED_SIZE * 2 for consistent and efficient hex formatting.